For a gable roof with common rafter length of 14', how many full bundles of wood shingles are required for a ridge length of 30' if 10% waste is added?

To determine the correct amount of wood shingles required for a gable roof with a ridge length of 30', first, it’s important to look at the basics of roofing material calculations. The shingles are usually sold in bundles that cover a certain amount of square feet.

Given that the common rafter length is 14', you can calculate the area to be covered. A gable roof has two slopes, meaning that the actual roofing area is doubled. The area of one side of the roof can be determined by multiplying the length of the rafter by the ridge length. For the given values, the area for one slope would be approximately:

• Area of one slope = Rafter length x (Ridge length / 2)

• Assuming an average slope or width that would be close enough for simplicity, use the full slope length for initial rough calculations.

After calculating the area for one side, you would then double this area to account for both sides of the gable.

Next, considering that you need to account for waste (in this case, 10%), the calculation should factor in an additional amount to cover any damaged, cut, or misplaced shingles during installation.

If, through the calculations involving the correct area, you find that